ZyXEL Communications GS2200-24 Series, Руководство пользователя

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Chapter 8 Basic Setting
GS2200-24 User’s Guide
76
8.5 Introduction to VLANs
A VLAN (Virtual Local Area Network) allows a physical network to be partitioned
into multiple logical networks. Devices on a logical network belong to one group. A
device can belong to more than one group. With VLAN, a device cannot directly
talk to or hear from devices that are not in the same group(s); the traffic must
first go through a router.
In MTU (Multi-Tenant Unit) applications, VLAN is vital in providing isolation and
security among the subscribers. When properly configured, VLAN prevents one
subscriber from accessing the network resources of another on the same LAN,
thus a user will not see the printers and hard disks of another user in the same
building.
VLAN also increases network performance by limiting broadcasts to a smaller and
more manageable logical broadcast domain. In traditional switched environments,
all broadcast packets go to each and every individual port. With VLAN, all
broadcasts are confined to a specific broadcast domain.
Note: VLAN is unidirectional; it only governs outgoing traffic.
See Chapter 9 on page 87 for information on port-based and 802.1Q tagged
VLANs.
End Date Configure the day and time when Daylight Saving Time ends if you
selected
Daylight Saving Time . The time field uses the 24 hour
format. Here are a couple of examples:
Daylight Saving Time ends in the United States on the first Sunday of
November. Each time zone in the United States stops using Daylight
Saving Time at 2 A.M. local time. So in the United States you would
select
First , Sunday , November and 2:00 .
Daylight Saving Time ends in the European Union on the last Sunday of
October. All of the time zones in the European Union stop using Daylight
Saving Time at the same moment (1 A.M. GMT or UTC). So in the
European Union you would select
Last , Sunday , October and the last
field depends on your time zone. In Germany for instance, you would
select
2:00 because Germany's time zone is one hour ahead of GMT or
UTC (GMT+1).
Apply Click Apply to save your changes to the Switch’s run-time memory. The
Switch loses these changes if it is turned off or loses power, so use the
Save link on the top navigation panel to save your changes to the non-
volatile memory when you are done configuring.
Cancel Click Cancel to begin configuring this screen afresh.
Table 9 Basic Setting > General Setup (continued)
LABEL DESCRIPTION